A beast-like snarl snorts beyond the crest of a muddy ORV trail, but this is no ordinary wild animal or hog, it's the furiously quick 702-hp Ram 1500 TRX. Under the hood, a powerful supercharged 6.2-liter V-8 sucks up fuel as if it were drinking from a garden hose. An eight-speed automatic transmission handles gear shifts and the truck's four-wheel drive system carries this enormous off-road animal in even the most treacherous places. The TRX only has two predators to...